US 5,649,483 AGranted

Device for the automatic singling-out of sheets in the delivery of a sheet-fed rotary printing press

AssigneeHeidelberger Druckmaschinen AG

InventorsRichard Mack, Udo Lautenklos, Rainer Klenk, Roland Hirth

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Abstract

Individual sheets are singled out in a delivery of a sheet-fed rotary printing press. The delivery has a chain delivery with gripper bars extending transversely to the sheet-transport direction. The gripper bars are disposed on revolvingly driven transport chains and carry spaced apart sheet grippers disposed side by side. The sheet grippers grip the leading edges of the sheets and slave them to a main sheet pile. The gripper release is subject to an adjustable control for delayed sheet release, so that selected sheets may be transported beyond the main sheet pile. Revolvingly drivable suction tapes suction-grip the sheets which are released by the grippers with the delay, and they transport those sheets in the transport direction across and beyond the main sheet pile and onto a single sheet depository. The sheet depository is movably disposed in or on the printing-press frame. The suction tapes have upper suction surfaces at a raised position which extend between the sheet grippers. The grippers delay the sheet release until at least a leading region of the respective sheet is located above the suction tapes.

Claims16

Dependent claims

A delivery in a sheet-fed rotary printing machine for depositing sheets to a main sheet pile and, selectively, for singling-out individual sheets to a single-sheet delivery, comprising:

a chain delivery with revolvingly driven transport chains, a plurality of mutually spaced-apart gripper bars driven by said transport chains, said gripper bars extending transversely to a sheet transport direction, and mutually spaced apart sheet grippers disposed on gripper bars for gripping consecutively arriving sheets by a leading edge thereof and transporting the sheets onto a main sheet pile;
a sheet depository for receiving singled-out sheets;
a revolvingly drivable suction tape disposed between the main sheet pile and said sheet depository, said suction tape being subjectable to suction air, and having an upper suction surface extending between said grippers;
and
an adjustable control operatively associated with said grippers for selectively releasing sheets in a delayed manner above said upper suction surface extending between said grippers, such that said suction tape suction-grips the sheets which have been released in the delayed manner and transports the sheets in the sheet-transport direction beyond the main sheet pile and onto said sheet depository.

2 more elements

Dependencies are inferred from the claim text.